Monitor Oracle archived redo log directory

Question: What do I do to monitor
my archived redo log directory to keep it from getting full
and locking up my database? Is there a script to
monitor my alert log directory?

Answer: You
can easily monitor your archived redo log directory to send
an alert when it reaches 90% full. The solution fix is
to delete the oldest archived redo log files, or move them
into another mount point. Low free space in the
archived redo log directory requires a special procedure.
If the archived redo log directory becomes full, your Oracle
database will hang up. This procedure send a text message
alert to the DBA’s phone and allows the Oracle Remote DBA to
add space (or move old redo logs) before the database hangs.

Here is an example of a UNIX script for keeping the
archived redo log directory free of elderly files. As
we know, it is important to keep room in this directory,
because Oracle may “lock-up” if it cannot write a current
redo log to the archived redo log filesystem. This script
could be used in coordination with Oracle Recovery Manager (rman)
to only remove files after a full backup has been taken.
This can be scheduled to run using a crontab (cron) task:

As we see, it is very easy to clean-out the redo log
directory, and you can monitor the spaced used in the
archived redo log directory with the df –k UNIX/Linux
command. You can also monitor the archived redo log
directory status with Oracle Enterprise Manager (OEM).

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